package cn.yunyichina.provider.hisiface.sdk.util;

import java.security.MessageDigest;

public class MD5Utils {

	/**
	 * 生成32位md5
	 * 
	 * @param str
	 * @return
	 */
	public static String string2MD5(String str) {
		try {
			MessageDigest md5 = MessageDigest.getInstance("MD5");
			
			char[] charArray = str.toCharArray();
			byte[] byteArray = new byte[charArray.length];

			for (int i = 0; i < charArray.length; i++) {
				byteArray[i] = (byte) charArray[i];
			}
			byte[] md5Bytes = md5.digest(byteArray);
			
			StringBuffer hexValue = new StringBuffer();
			for (int i = 0; i < md5Bytes.length; i++) {
				int val = ((int) md5Bytes[i]) & 0xff;
				if (val < 16)
					hexValue.append("0");
				hexValue.append(Integer.toHexString(val));
			}
			
			return hexValue.toString();
		} catch (Exception e) {
			e.printStackTrace();
			return "";
		}

	}

	/**
	 * 生成16位md5
	 * 
	 * @param str
	 * @return
	 */
	public static String string2MD5_16(String str) {
		String md5 = string2MD5(str);
		return md5.substring(8, 24);
	}

}
